de.intarsys.pdf.postscript.Handler Maven / Gradle / Ivy

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/*
 * Copyright (c) 2007, intarsys consulting GmbH
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * - Neither the name of intarsys nor the names of its contributors may be used
 *   to endorse or promote products derived from this software without specific
 *   prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package de.intarsys.pdf.postscript;

import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Stack;

/**
 * Very simple class to execute postscript code as it it parsed (which
 * means to execute it again you have to parse it again)
 */
public class Handler {

	private PSArray procedure;

	private Stack stack;

	public Handler() {
		super();
		stack = new Stack();
	}

	public Object get(int index) {
		return stack.get(index);
	}

	public Object peek() {
		return stack.peek();
	}

	public Object pop() {
		return stack.pop();
	}

	public List popResult() {
		List result;
		Iterator iterator;

		result = new ArrayList(stack.size());
		iterator = stack.iterator();
		while (iterator.hasNext()) {
			result.add(iterator.next());
		}
		stack.removeAllElements();
		return result;
	}

	public void processEndArray() {
		throw new UnsupportedOperationException();
	}

	public void processEndProcedure() {
		stack.push(procedure);
		procedure = null;
	}

	public void processIdentifier(String string) throws ParseException {
		if (procedure != null) {
			procedure.add(new PSName(string));
			return;
		}

		String name;
		Class clazz;
		IOperator operator;

		name = MessageFormat.format("de.intarsys.pdf.postscript.Operator_{0}", //$NON-NLS-1$
				new Object[] { string });
		try {
			clazz = Class.forName(name);
		} catch (Exception ex) {
			throw new ParseException(ex);
		}
		// all operator classes should have an "Instance" field by convention
		try {
			operator = (IOperator) clazz.getField("Instance").get(null); //$NON-NLS-1$
		} catch (Exception ex) {
			throw new ParseException(ex);
		}
		operator.execute(this);
	}

	public void processImmediateIdentifier(String string) {
		throw new UnsupportedOperationException();
	}

	public void processKeyIdentifier(String string) {
		throw new UnsupportedOperationException();
	}

	public void processLiteral(double d) {
		if (procedure != null) {
			procedure.add(new PSPrimitiveObject(d));
			return;
		}
		stack.push(d);
	}

	public void processLiteral(int i) {
		if (procedure != null) {
			procedure.add(new PSPrimitiveObject(i));
			return;
		}
		stack.push(i);
	}

	public void processLiteral(Object object) {
		if (procedure != null) {
			procedure.add(new PSPrimitiveObject(object));
			return;
		}
		stack.push(object);
	}

	public void processStartArray() {
		throw new UnsupportedOperationException();
	}

	public void processStartProcedure() {
		procedure = new PSArray();
	}

	public void push(Object value) {
		stack.push(value);
	}

	public void pushArgs(List args) {
		stack.addAll(args);
	}

	public int size() {
		return stack.size();
	}
}