svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.library / org.gvsig.expressionevaluator / org.gvsig.expressionevaluator.lib / org.gvsig.expressionevaluator.lib.impl / src / main / java / org / gvsig / expressionevaluator / impl / function / programming / ForEachFunction.java @ 44738
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package org.gvsig.expressionevaluator.impl.function.programming; |
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import org.apache.commons.lang3.Range; |
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import org.gvsig.expressionevaluator.Codes; |
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import org.gvsig.expressionevaluator.Function; |
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import org.gvsig.expressionevaluator.Interpreter; |
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import org.gvsig.expressionevaluator.spi.AbstractFunction; |
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import org.gvsig.expressionevaluator.ExpressionRuntimeException; |
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import org.gvsig.expressionevaluator.MutableSymbolTable; |
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public class ForEachFunction extends AbstractFunction { |
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public static final String NAME = "FOREACH"; |
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public ForEachFunction() {
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super(Function.GROUP_PROGRAMMING,
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NAME, |
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Range.is(3),
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"The foreach() function evaluate body for every element of the iterable.",
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NAME+"( varname, iterable, body )",
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null,
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"Object",
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false
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); |
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} |
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@Override
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public boolean isHidden() { |
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return true; |
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} |
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@Override
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public boolean useArgumentsInsteadObjects() { |
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return true; |
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} |
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@Override
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public boolean allowConstantFolding() { |
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return false; |
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} |
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@Override
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public Object call(Interpreter interpreter, Object[] args) throws Exception { |
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throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. |
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} |
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@Override
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public Object call(Interpreter interpreter, Codes args) throws Exception { |
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if( !(interpreter.getSymbolTable() instanceof MutableSymbolTable) ) { |
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throw new ExpressionRuntimeException("The use of forech loops require a mutable symbol table."); |
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} |
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MutableSymbolTable symbolTable = (MutableSymbolTable) interpreter.getSymbolTable(); |
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Object body = null; |
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String varname = getObject(interpreter, args, 0).toString(); |
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Iterable iterable = (Iterable) getObject(interpreter, args, 1); |
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for (Object value : iterable) { |
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symbolTable.setVar(varname, value); |
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body = getObject(interpreter, args, 2);
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} |
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return body;
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} |
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} |